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Jamba2

AI21 LabsOpen WeightsPending Human Review

Jamba2 is an AI21 language-model release. Jamba2 is an enterprise-focused release emphasizing grounded answers and instruction adherence with concise outputs. Dense 3B and sparse Mini tiers share the hybrid design and 256K context. Both release under Apache 2.0, expanding commercial weight access relative to the custom-licensed 1.x instruction models. Public weights and AI21 Studio support local and hosted deployment. Long context does not guarantee complete retrieval or factual correctness, and deployed throughput depends on hardware, precision, and prompt length.

2026-01-08
3B dense; Mini 52B total, 12B active
Hybrid Mamba state-space / Transformer; MoE in larger tiers
Apache-2.0

Specifications

Parameters
3B dense; Mini 52B total, 12B active
Architecture
Hybrid Mamba state-space / Transformer; MoE in larger tiers
License
Apache-2.0
Context Window
262,144 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Jamba
API Access
Available
Chat Interface
Not Available
Variants
3BMini

Capabilities & Limitations

Capabilities
text generationlong contextinstruction following
Known Limitations
Long-input quality requires task evaluationLicense and weight footprint vary by tier
Notable Use Cases
enterprise question answeringdocument assistantsprivate deployment

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